The present invention refers to the use of a compound of Formula or pharmaceutically acceptable salt, solvate, isomer, or prodrug thereof for the treatment andor prophylaxis of hematological dyscrasias, including myelodysplastic syndromes and for improving the efficacy of chemotherapy, radiation therapy andor cancer immunotherapy. The core is arranged in such a way that the magnet field which is generated in said region generally has a direction perpendicular from the short side of the mould towards the centre of the latter. An increased accuracy is achieved by the provision of damping in relation to the speed of the armature, by arranging a sensing winding on the armature and connecting a calculation unit to the sensing winding. The crystal-filled microcapsules prepared by this method can be conveniently harvested and stored while keeping the encapsulated crystals in essentially pristine condition due to the rugged, protective membrane.